Group-based user pairing of virtual MIMO for uplink of LTE system

The long term evolution of UMTS, UTRA LTE, can facilitate high user data rates using OFDMA combined with MIMO (multiple input multiple output) techniques. In this paper, we focus on the uplink virtual MIMO capacity and its pairing algorithms. In the uplink for LTE, the power and complexity for the terminal circuit design is critical, so LTE using a technique called virtual MIMO pairing two out of several users to transmitting signal at the same time-frequency resource, and make the system virtually two transmitting antennas at the terminal. We propose a new pairing algorithm called group-based user pairing and compare with the conventional pairing algorithms. From the simulation and analysis we can see the great improvement in term of system capacity and certain reduction in term of complexity.